#define   _CRT_SECURE_NO_WARNINGS  1
#include<stdio.h>
size_t my_strlen(char* p)
{
	char* cur = p;
	while (*p++)
		;
	return  p - cur;
}
int main()
{
	char arr[] = "abcdef";
	size_t ret = my_strlen(arr);
	printf("%zd", ret);
	return 0;
}